rheidityn.

Brit.

/riːˈɪdᵻti/, U.S.

/ˌriˈɪdᵻdi/

Origin: Formed within English, by derivation. Etymons: rheid adj., -ity suffix.

Etymology: < rheid adj. + -ity suffix.

Geology.

A measure of the rheid behaviour of a substance, equal to the time required for the viscous deformation to become one thousand times greater than the elastic deformation under some particular conditions; (also) the phenomenon of rheid behaviour.

ΚΠ

1954 S. W. Carey in Jrnl. Geol. Soc. Austral. 1 70 Duration..to allow the viscous term to become a thousand times as great as the elastic term... This may be adopted arbitrarily as the threshold of wholly fluid behaviour and will be referred to as the rheidity of the substance for the given conditions.

1965 A. Holmes Princ. Physical Geol. (rev. ed.) xi. 282 Fifty years ago little or nothing was known of the phenomena of rheidity and diapirism.

1991 M. A. Summerfield Global Geomorphol. (BNC) 121 The rheidity of ice is a few weeks, that of salt about a year.

2007 R. J. Huggett Fund. Geomorphol. (ed. 2) iv. 102/2 The transformation of rock from mesosphere..to the lithosphere chiefly entails temperature and viscosity (rheidity) changes.

This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022).

单词	rheidity
释义	rheidityn. Brit. /riːˈɪdᵻti/, U.S. /ˌriˈɪdᵻdi/ Origin: Formed within English, by derivation. Etymons: rheid adj., -ity suffix. Etymology: < rheid adj. + -ity suffix. Geology. A measure of the rheid behaviour of a substance, equal to the time required for the viscous deformation to become one thousand times greater than the elastic deformation under some particular conditions; (also) the phenomenon of rheid behaviour. ΚΠ 1954 S. W. Carey in Jrnl. Geol. Soc. Austral. 1 70 Duration..to allow the viscous term to become a thousand times as great as the elastic term... This may be adopted arbitrarily as the threshold of wholly fluid behaviour and will be referred to as the rheidity of the substance for the given conditions. 1965 A. Holmes Princ. Physical Geol. (rev. ed.) xi. 282 Fifty years ago little or nothing was known of the phenomena of rheidity and diapirism. 1991 M. A. Summerfield Global Geomorphol. (BNC) 121 The rheidity of ice is a few weeks, that of salt about a year. 2007 R. J. Huggett Fund. Geomorphol. (ed. 2) iv. 102/2 The transformation of rock from mesosphere..to the lithosphere chiefly entails temperature and viscosity (rheidity) changes. This entry has been updated (OED Third Edition, June 2010; most recently modified version published online March 2022). < n.1954
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